Organization, Basis of Presentation and Significant Accounting Policies (Details 2) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Reconciliation of Basic and Diluted Earnings per Share of Common Stock
Weighted average number of basic shares outstanding	399	[1]	304	[1]	304	[1]
Assumed exercise of dilutive stock options and awards	2	[2]	1	[2]	2	[2]
Weighted average number of diluted shares outstanding	401	[1]	305	[1]	306	[1]
Earnings available to Parent	$ 885		$ 742		$ 872
Basic earnings per share of common stock	$ 2.22		$ 2.44		$ 2.87
Diluted Earnings Per Share	$ 2.21		$ 2.42		$ 2.85

[1] Includes 113 million shares issued to AE shareholders for the periods subsequent to the merger date (see Note 2, Merger).

[2] The number of potentially dilutive securities not included in the calculation of diluted shares outstanding due to their antidilutive effect were not significant for the years ending December 31, 2011, 2010 or 2009.